[c-nsp] ME3400 Output Drops
Rin
rintrum at gmail.com
Thu May 13 23:43:43 EDT 2010
Hi group,
We are facing output drops problem on interface f0/2 of ME3400. Our topology
as below:
Metro-------(G0/1)ME3400(f0/2)-------CPE---------STB----------TV
|________PC
We try to watch a HD movie on TV and download file on PC at the same time.
The download rate is at 50Mbps, movie data transfer rate at 10Mbps. Due to
the output drop, the HD movie quality is not good. The output below shows
the drop:
C3400# sho int f0/2
FastEthernet0/2 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0026.52a8.4a04 (bia 0026.52a8.4a04)
Description: DUCMINH-modem-test
MTU 1998 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 119/255, rxload 75/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, link type is auto, media type is 100BaseLX-FE SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:02:25
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5034
Queueing strategy: fifo
Output queue: 0/4096 (size/max)
5 minute input rate 29711000 bits/sec, 3500 packets/sec
5 minute output rate 46934000 bits/sec, 5307 packets/sec
881702 packets input, 941885538 bytes, 0 no buffer
Received 8 broadcasts (8 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 8 multicast, 0 pause input
0 input packets with dribble condition detected
1164876 packets output, 1238627577 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
I try to apply egress QoS on interface f0/2 that reserve 23% bandwidth for
HD movie traffic (COS=4), the HD movie quality is good but there is still
packet drop for download traffic. Check below output:
C3400#sho policy-map int f0/2
FastEthernet0/2
Service-policy output: EGRESS_QOS
Class-map: COS45 (match-any)
237435 packets
Match: cos 4 5
Bandwidth percent 23 (23000000 bps)
Output Queue:
Max queue-limit default threshold: 160
Tail Packets Drop: 0
Class-map: class-default (match-any)
972306 packets
Match: any
Output Queue:
Max queue-limit default threshold: 160
Tail Packets Drop: 5266
Bandwidth percent 77 (77000000 bps)
Output Queue:
Max queue-limit default threshold: 160
Tail Packets Drop: 5266
I try to change the queue size for default class to maximum value 544. The
output drops reduce but there's still drop.
C3400(config)#do sho policy-map int f0/2
FastEthernet0/2
Service-policy output: EGRESS_QOS
Class-map: COS45 (match-any)
219146 packets
Match: cos 4 5
Bandwidth percent 23 (23000000 bps)
Output Queue:
Max queue-limit default threshold: 160
Tail Packets Drop: 0
Class-map: class-default (match-any)
882062 packets
Match: any
Tail Packets Drop: 181
Bandwidth percent 77 (77000000 bps)
Queue Limit
queue-limit 544 (packets)
Output Queue:
Max queue-limit default threshold: 544
Tail Packets Drop: 181
My question is why ME3400 drop packet even the data rate is much less than
the interface capability (60Mbps/100Mbps). Anyone has other solution for
this issue?
Below is the show version output
C3400#sho ver
Cisco IOS Software, ME340x Software (ME340x-METROIPACCESSK9-M), Version
12.2(50)SE1, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Mon 06-Apr-09 10:05 by amvarma
Image text-base: 0x00003000, data-base: 0x01C00000
ROM: Bootstrap program is ME340x boot loader
BOOTLDR: ME340x Boot Loader (ME340x-HBOOT-M) Version 12.2(40r)SE1, RELEASE
SOFTWARE (fc1)
C3400 uptime is 3 hours, 46 minutes
System returned to ROM by power-on
System image file is "flash:me340x-metroipaccessk9-mz.122-50.SE1.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found
at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export at cisco.com.
cisco ME-3400-24FS-A (PowerPC405) processor (revision C0) with
118784K/12280K bytes of memory.
Processor board ID XXXXXXXX
Last reset from power-on
3 Virtual Ethernet interfaces
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:26:52:A8:4A:00
Motherboard assembly number : 73-11063-09
Power supply part number : 341-0203-01
Motherboard serial number : XXXXXXXXX
Power supply serial number : XXXXXXXXX
Model revision number : C0
Motherboard revision number : A0
Model number : ME-3400-24FS-A
System serial number : XXXXXXXX
Top Assembly Part Number : 800-28864-01
Top Assembly Revision Number : G0
Version ID : V01
CLEI Code Number : XXXXXXXX
Hardware Board Revision Number : 0x04
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 ME-3400-24FS-A 12.2(50)SE1
ME340x-METROIPACCESSK9-M
Configuration register is 0xF
Sorry for the long email. Thanks,
Rin
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